/*
Copyright (C) 2015 Jochem Raat

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <random>
#include <fractalNoise.h>

// This class takes a height map of an island and its width and height
// and generates a heat map represented as a array of doubles, where
// higher numbers represent higher temperatures.
class HeatMapGenerator {
public:
    // The constructor takes a random generator to pass to the
    // PerlinNoiseGenerator.
    HeatMapGenerator(std::mt19937 *mt) : fractalNoiseGenerator(mt) { }

    // Generate a heat map for the given height map, this is done by
    // combining the height map with a random perlin noise map.
    double *generateHeatMap(double *heightmap,
                            unsigned width,
                            unsigned height);

private:
    // Used to generate the perlin noise maps
    FractalNoiseGenerator fractalNoiseGenerator;

    // Used to generate the heat at a point from the height and
    // noise.
    double generateHeatPoint(double height, double noise);
};
